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<title>算法训练 最长字符串</title>
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 <p>求出5个字符串中最长的字符串。每个字符串长度在100以内，且全为小写字母。</p>
<p>样例输入<br />
one two three four five</p>
<p>样例输出<br />
three<br />
&nbsp;</p>